<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			let obj = {}
			if(obj.str){
				obj.str = '1'
			}else{
				obj.str = 123
			}
			console.log(obj.str)
		</script>
	</body>
</html>
